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