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