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