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