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