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