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)(19,27,30,23)(20,24,33,40)(22,26,35,42)(28,39,32,36)(29,38,31,37)(34,41,45,48)(43,47,44,46)(2,6)(7,8)(9,10)(11,14)(12,13)(15,16)(17,19)(18,23)(20,32)(21,30)(22,29)(24,39)(25,27)(26,37)(28,33)(31,35)(34,44)(36,40)(38,42)(41,47)(43,45)(46,48) involution — undirected(1,3,5,4)(2,7,6,8)(10,13)(14,15)(17,20)(18,24)(19,28)(21,33)(22,34)(23,36)(25,40)(26,41)(27,39)(29,43)(30,32)(31,44)(35,45)(37,46)(38,47)(42,48)(9,11,12,16)(10,14,13,15)(19,29)(22,35)(23,37)(26,42)(27,38)(28,43)(30,31)(32,44)(34,45)(36,46)(39,47)(41,48)(1,4,5,3)(2,7,6,8)(18,25)(20,33)(23,27)(26,42)(28,32)(34,45)(37,38)(43,44)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.