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