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