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