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