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