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