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