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