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