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