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