One vertex per element, one color per generator, with an edge from x to x·s.
(5,6)(7,17)(8,18)(9,14)(10,15)(11,16)(12,19)(13,20)(22,26)(24,31)(27,35)(28,32)(29,33)(34,36) involution — undirected(1,2)(3,4)(5,7)(6,12)(8,16)(9,18)(10,19)(11,13)(14,17)(15,20)(21,22)(23,27)(24,32)(25,28)(26,31)(29,34)(30,36)(33,35) involution — undirected(2,4)(5,8,11,12)(6,13,16,7)(9,20,10,17)(14,19,15,18)(21,23,25,30)(22,27,28,36)(24,33,31,29)(26,34,32,35)(5,9,11,10)(6,14,16,15)(7,18,13,19)(8,20,12,17)(22,28)(26,32)(27,36)(34,35)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.