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