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