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