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