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