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