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