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