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