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