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