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