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