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