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