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