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