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