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