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