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