One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,12)(5,6)(8,13)(9,10)(11,15)(14,16)(17,18)(19,20)(21,29)(22,24)(23,25)(26,30)(27,31)(28,32)(34,39)(35,42)(41,47)(43,45) involution — undirected(1,2)(3,9)(4,8)(5,6)(7,10)(11,15)(12,13)(14,16)(17,19,22,25)(18,23,24,20)(21,27,30,32)(26,31,29,28)(33,34)(35,40)(36,41)(37,42)(38,39)(43,48)(44,47)(45,46)(2,6)(3,10)(4,13)(14,15)(18,24)(20,23)(21,30)(27,32)(35,42)(36,44)(37,40)(41,47) involution — undirected(1,2)(3,9)(4,8)(5,6)(7,10)(11,15)(12,13)(14,16)(17,20,22,23)(18,25,24,19)(21,28,30,31)(26,32,29,27)(33,35,38,42)(34,40,39,37)(36,45,44,43)(41,46,47,48)(1,3,5,10)(2,7,6,9)(4,11,13,16)(8,14,12,15)(17,18)(19,20)(21,26)(22,24)(23,25)(27,28)(29,30)(31,32)(33,36,38,44)(34,41,39,47)(35,43,42,45)(37,46,40,48)(1,4)(2,8)(3,11)(5,13)(6,12)(7,14)(9,15)(10,16)(17,21,22,30)(18,26,24,29)(19,27,25,32)(20,28,23,31)(33,37,38,40)(34,42,39,35)(36,46,44,48)(41,45,47,43)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.