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