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