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