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