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)(17,18)(19,26)(20,24)(21,25)(22,23)(27,31)(28,30)(29,32)(1,3)(2,6)(4,7)(5,8)(9,10)(11,15)(12,14)(13,16)(17,19,21,22)(18,23,25,26)(20,28,29,27)(24,31,32,30)(9,11)(10,13)(12,16)(14,15)(18,23)(19,22)(20,29)(24,31)(25,26)(30,32) involution — undirected(1,2,5,4)(3,7,8,6)(11,16)(13,15)(17,20,21,29)(18,24,25,32)(19,27,22,28)(23,30,26,31)(1,4,5,2)(3,7,8,6)(10,14)(13,15)(18,25)(20,29)(23,26)(27,28)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.