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