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