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