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