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