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