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