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