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