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