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