One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,4)(3,7,8,6)(11,15)(14,16)(17,18)(19,23)(20,28)(21,26)(22,25)(24,27)(29,31)(30,32)(1,3)(2,6)(4,7)(5,8)(10,13)(11,15)(17,19,22,21)(18,23,25,26)(20,27,29,30)(24,31,32,28)(1,4,5,2)(3,7,8,6)(9,10)(11,14)(12,13)(15,16)(17,20,22,29)(18,24,25,32)(19,27,21,30)(23,31,26,28)(3,8)(6,7)(10,13)(14,16)(18,25)(23,26)(24,32)(28,31) involution — undirected(9,11,12,15)(10,14,13,16)(17,19,22,21)(18,26,25,23)(20,27,29,30)(24,28,32,31)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.