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