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