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