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