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