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