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