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)(23,28,32,27)(24,33,35,25)(30,36,34,31)(6,9)(7,12)(13,14)(15,19)(16,17)(18,20)(21,23,26,32)(22,27,29,28)(24,34,35,30)(25,31,33,36)(6,9)(10,11)(14,16)(18,19)(21,23)(22,28)(24,34)(25,36)(26,32)(27,29)(30,35)(31,33) involution — undirected(1,2,3,4)(5,7,8,12)(6,10,9,11)(13,15)(14,18)(16,19)(17,20)(21,24)(22,25)(23,30)(26,35)(27,36)(28,31)(29,33)(32,34)(5,6)(7,10)(8,9)(11,12)(13,16,17,14)(15,19,20,18)(21,25)(22,24)(23,31)(26,33)(27,34)(28,30)(29,35)(32,36)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.