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)(8,16,18,15,17,20,19,11)(21,22,25,28,26,30,24,29)(23,31,32,27,34,35,33,36)(1,2,3,4)(5,7)(6,10)(8,15)(9,12)(11,17)(13,14)(16,18)(19,20)(21,23)(22,27)(24,32)(25,33)(26,34)(28,31)(29,35)(30,36)(5,8)(6,11)(7,15)(9,18)(10,17)(12,16)(13,20)(14,19)(22,28)(24,25)(27,31)(29,30)(32,33)(35,36) involution — undirected(8,17)(11,15)(16,20)(18,19)(21,24,26,25)(22,28,30,29)(23,32,34,33)(27,31,36,35)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.