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