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