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