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