One vertex per element, one color per generator, with an edge from x to x·s.
(2,6)(7,9)(8,13)(14,15)(17,18)(19,25)(20,24)(21,26)(22,23)(27,32)(28,31)(29,30) involution — undirected(1,2)(3,7)(4,8)(5,6)(9,11)(10,14)(12,13)(15,16)(17,19,23,20)(18,24,22,25)(21,28,30,27)(26,32,29,31)(33,34)(35,39)(36,40)(37,38)(41,47)(42,45)(43,48)(44,46)(4,12)(8,13)(10,16)(14,15)(18,22)(24,25)(26,29)(31,32)(34,38)(39,45)(40,46)(47,48) involution — undirected(1,2)(3,9)(4,8)(5,6)(7,11)(10,15)(12,13)(14,16)(17,20,23,19)(18,25,22,24)(21,27,30,28)(26,31,29,32)(33,35,37,42)(34,39,38,45)(36,43,44,41)(40,48,46,47)(1,3,5,11)(2,7,6,9)(4,10,12,16)(8,14,13,15)(17,21,23,30)(18,26,22,29)(19,27,20,28)(24,31,25,32)(33,36,37,44)(34,40,38,46)(35,41,42,43)(39,47,45,48)(1,4,5,12)(2,8,6,13)(3,10,11,16)(7,14,9,15)(17,22,23,18)(19,25,20,24)(21,29,30,26)(27,32,28,31)(33,34)(35,39)(36,40)(37,38)(41,47)(42,45)(43,48)(44,46)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.