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