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)(19,24)(20,26)(21,27)(22,31)(23,28)(25,29)(30,32)(1,3,4,8)(2,5,6,7)(9,10)(11,14)(12,13)(15,16)(17,19,23,29)(18,24,28,25)(20,21,30,22)(26,27,32,31)(10,13)(14,16)(17,20)(18,25)(19,22)(21,29)(23,30)(24,28)(26,31)(27,32) involution — undirected(2,6)(5,7)(9,11,12,15)(10,14,13,16)(17,20)(18,26)(19,21)(22,29)(23,30)(24,27)(25,31)(28,32)(3,8)(5,7)(10,13)(14,16)(17,21,23,22)(18,27,28,31)(19,20,29,30)(24,26,25,32)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.