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