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