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