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