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