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