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