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