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