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