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