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