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