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