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