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