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