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