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