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