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