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