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